diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/src/external-resources.qdoc | 5 | ||||
| -rw-r--r-- | doc/src/platforms/platform-notes.qdoc | 42 |
2 files changed, 42 insertions, 5 deletions
diff --git a/doc/src/external-resources.qdoc b/doc/src/external-resources.qdoc index 5522082..04d7ccb 100644 --- a/doc/src/external-resources.qdoc +++ b/doc/src/external-resources.qdoc @@ -483,3 +483,8 @@ \externalpage http://www.symbiansigned.com \title Symbian Signed */ + +/*! + \externalpage http://www.developer.nokia.com/Community/Wiki/Graphics_memory_handling + \title Graphics Out Of Memory monitor +*/ diff --git a/doc/src/platforms/platform-notes.qdoc b/doc/src/platforms/platform-notes.qdoc index 87b6298..231c58a 100644 --- a/doc/src/platforms/platform-notes.qdoc +++ b/doc/src/platforms/platform-notes.qdoc @@ -752,11 +752,43 @@ plugin. If the Helix plugin fails to load, the MMF plugin, if present on the device, will be loaded instead. - \section1 QtOpenGL Support - - Qt 4.7 introduces the QtOpenGL module to Symbian^3. QtOpenGL is supported on - devices which support OpenGL ES 2.0. Symbian platforms prior to Symbian^3 - are not supported. + \section1 Hardware Accelerated Rendering + + The default graphics system on Symbian^3 is OpenVG, which uses OpenVG + hardware to accelerate \l QPainter functions. There are a few exceptions, + where Qt will use software rendering fallback. + + Devices like the N8 and C7 only have 32Mb of GPU memory and limited support + for EGL surface transparency. These devices can be identified by querying + the\c GL_RENDERER or \c VG_RENDERER string which evaluates to \c {VideoCore III}. + On these devices, Qt will use software rendering in cases listed below. + + \list + \o Translucent windows + \o Dialogs + \o Popups + \endlist + + \section1 QtOpenGL Support in Symbian + + Qt 4.7 introduces the \l {QtOpenGL} module to Symbian^3. QtOpenGL is + supported on devices which support OpenGL ES 2.0. Symbian platforms prior + to Symbian^3 are not supported. + + \l QGLWidget usage as a \l QGraphicsView viewport is not recommended on + Symbian. The OpenVG graphics system is not able to manage OpenGL graphics + resources. Also, a QGLWidget object is not able to release its GPU resources + when the application goes to the background. If OpenGL functionality is + needed, OpenGL graphics system usage is recommended. If an application + decides to use QGLWidget, then it is the application's responsibility to + destroy and release QGLWidget and related OpenGL resources when the + application goes to the background. Otherwise, the \l{Graphics Out Of Memory monitor} + may decide to kill the application as it consumes GPU resources while in the + background. + + \note \l QGLBuffer, \l QGLFramebufferObject, \l QGLPixelBuffer, \l + QGLShader, and \l QGLShaderProgram are direct GPU resources and it is the + application's responsibility to manage them. \section1 UI Performance in devices prior to Symbian^3 |